RAP and other chimes? I guess I don't know what you are talking about. I used the pigtail connector for the HU and a pigtail connector for GM wireing harnesses. This is what I used to plug into the car harness. Not saying you have to get it from there, I just used that as an example.

ZZ Performance

Then you should get one that plugs into the HU. I believe it comes with the HU.